Move MessageLoop to base namespace.

chrome/browser/printing/print_job_worker_owner.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_PRINTING_PRINT_JOB_WORKER_OWNER_H__
 #define CHROME_BROWSER_PRINTING_PRINT_JOB_WORKER_OWNER_H__
 
 #include "base/memory/ref_counted.h"
 #include "printing/printing_context.h"
 
+namespace base {
 class MessageLoop;
+}
+
 
 namespace printing {
 
 class PrintJobWorker;
 class PrintSettings;
 
 class PrintJobWorkerOwner
     : public base::RefCountedThreadSafe<PrintJobWorkerOwner> {
  public:
   // Finishes the initialization began by PrintJobWorker::GetSettings().
   // Creates a new PrintedDocument if necessary. Solely meant to be called by
   // PrintJobWorker.
   virtual void GetSettingsDone(const PrintSettings& new_settings,
                                PrintingContext::Result result) = 0;
 
   // Detach the PrintJobWorker associated to this object.
   virtual PrintJobWorker* DetachWorker(PrintJobWorkerOwner* new_owner) = 0;
 
   // Retrieves the message loop that is expected to process GetSettingsDone.
-  virtual MessageLoop* message_loop() = 0;
+  virtual base::MessageLoop* message_loop() = 0;
 
   // Access the current settings.
   virtual const PrintSettings& settings() const = 0;
 
   // Cookie uniquely identifying the PrintedDocument and/or loaded settings.
   virtual int cookie() const = 0;
 
  protected:
   friend class base::RefCountedThreadSafe<PrintJobWorkerOwner>;
 
   virtual ~PrintJobWorkerOwner() {}
 };
 
 }  // namespace printing
 
 #endif  // CHROME_BROWSER_PRINTING_PRINT_JOB_WORKER_OWNER_H__